“If you want to be unique in the world, to have the mysteries of the world and the secrets of wisdom revealed to you, repeat this teaching and be careful with it until the day of your passing. Do not seek understanding of what is behind you and do not search out the words of your lips. You will understand what is in your heart when you merit the beauty of the chariot [Merkavah]. Be careful with the glory of your Creator, and do not descend to it. And if you descend to it, do not enjoy it. And if you enjoy it, your end is to be banished from the world. ‘It is the glory of God to conceal a matter’ [Proverbs 25:2], lest you be banished from the world.”

Hechalot Zutarti (Lesser Palaces) [335]